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[英]How to pass props from a pre-filled React input form back to Express?
[英]Grabbing content from react input form when it is pre-filled by browser or password manager
我有一個React應用程序(帶有React Segment UI),到目前為止運行良好。 我有一個登錄表單,與任何登錄表單一樣,我允許它由密碼管理器或瀏覽器自動填寫。 我想做的是獲取預先填寫的表格中的值,主要是檢查它們是否已經填寫。
我怎樣才能做到這一點?
當前,這是我的組件的外觀:
export default class SignIn extends React.PureComponent {
handleSubmit (evt) {
// handle submit
}
isSignInDisabled () {
// Would like to check here is the email and password
// have been prefilled since with this method it won't work
// in this case.
return (
!this.props.email.length ||
!this.props.password.length
)
}
render () {
const { email, password } = this.props
return (
<Form onSubmit={evt => {
this.handleSubmit(evt)
}}>
<Form.Field>
<Form.Input
type='email'
label='Email'
value={email}
onChange={evt => setEmail(evt.target.value)}
/>
</Form.Field>
<Form.Field>
<Form.Input
type='password'
label='Password'
value={password}
onChange={evt => setPassword(evt.target.value)}
/>
</Form.Field>,
<Form.Field>
<Button type='submit' disabled={this.isSignInDisabled()}>Sign In</Button>
</Form.Field>
</Form>
)
}
}
要從輸入字段中大致獲取值,可以使用ref
機制。
您應該小心 : ref
與真實的DOM交互,而不是虛擬的React DOM。
在官方文檔中了解有關ref
更多信息。
class Form extends React.Component { handleSubmit = (e) => { e.preventDefault(); console.log('Values are', this.firstName.value, this.lastName.value); } render() { return ( <form className="custom-form" onSubmit={this.handleSubmit}> <input type="text" name="first_name" value="John" ref={(input) => { this.firstName = input; }} /> <input type="text" name="last_name" value="Doe" ref={(input) => { this.lastName = input; }} /> <button type="submit">Submit</button> </form> ); } }; const App = () => ( <div> <Form /> </div> ); ReactDOM.render(<App />, document.getElementById('react'));
.custom-form { display: block; padding: 10px; } .custom-form > input { display: block; margin-top: 10px; padding: 5px 10px; border: 1px solid #ddd; border-radius: 3px; } .custom-form > button { display: block; margin-top: 10px; padding: 5px 10px; background: #fff; border-radius: 3px; }
<script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.1.0/react.min.js"></script> <script src="https://cdnjs.cloudflare.com/ajax/libs/react/15.1.0/react-dom.min.js"></script> <div id="react"></div>
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